unless they frequent a tanning salon or are photoshopped, the *typical* human's legs are somewhat redder toned than the rest of their body due to circulation - especially after physical activity.  attached is a more vivid example.

in the case of women, everything not covered by a tank top and shorts can be a touch darker as well due to tanning.

personally i cant stand the opposite:  'flood fill' skin textures where its a perfectly even beige tone from head to toes.

 

(if reposting a shrunken, copyright marked image from 3D.SK is a no-no then please delete it, however i dont see how what i posted could be used to texture since its shrunk to ~1/10th the original size).